java - Having trouble with "replaceall" command -

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i have string 

s1 = "7+8";

and

s2 = "7+";

i using following code subtract s2 s1

system.out.println(s1.replaceall(s2,""));

but giving output as

"+8"

why happening??

the regular expression "7+" matches 1 or more instances of "7". replaced, leaving "+8".

if want match exact strings, rather regular expressions, use replace instead of replaceall.

s1.replace(s2, "")

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